Versions - Different performances of the song by the same artist
Compilations - Other albums which feature this performance of the song
Covers - Performances of a song with the same name by different artists
This is an announcement of a Rebotcast. A Rebotcast is a type of Podcast, where the content is delivered by a synthesized voice. It's a "Rebotcast" because it synthesizes someone elses content, from an RSS feed, like a blog. In this first case, the blogger is Joi Ito.